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Umihara Kawase (海腹川背?) is a series of platform games, starring a nineteen year old Japanese school girl of the same name, who has somehow become lost in a world of mutated salt-water and fresh-water creatures.

The game world of Umihara Kawase is constructed from a set of interconnected levels known as fields. Each field connects to one or more fields deeper within the game via doors.

Fields are enclosed areas containing a number of static and moving platforms, ladders, spikes, enemy sea-life and one or more exit doors. The doors are often positioned in hard to reach places and it is the player's goal to plan a safe route to one. Each exit door in a field takes the player to a different field.

One completes the game by finding a safe route through the fields and finding a door to exit the world. Each of the Umihara Kawase games contains multiple routes through the fields and multiple exits.

The Umihara Kawase games have simple controls. The character is able to run, jump, climb onto ledges, climb ladders and most importantly throw her fishing line.

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